Pump



May 5, 1936 E. n. THORNTON 2,039,570

PUMP

Filed May 16, 1935 2 Sheets-Sheet 2 Patented May 5, 1936 UNITED STATES PATENT OFFICE 1 Claim.

` boilers and which can also be used as an air pump.

This invention also consists in certain other features of construction and in the combination and arrangement of several parts, to be herein- 1o after fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawings wherel5 in like characters denote like or corresponding parts throughout the several views, and in which:-

Figure 1 is a vertical sectional view through the pump showing the same as used as a boiler feed pump.

Figure 2 is a section on the line 2 2 of Figure 1.

Figure 3 is a section on the line 3-3 of Figure 1.

Figure 4 is a section on the line 4 4 of Figure 1.

In these drawings the numeral I indicates the cylinder of the pump operating means and the numeral 2 indicates a piston reciprocating in the cylinder and having a rod 3 connected therewith which extends through a gland 4 in the bottom of the cylinder. The upper portion of the rod 3 is hollow as. shown at 5. A steam chest 6 is attached to the top of the cylinder I and contains the two pistons I which are connected together by the yoke 8 which has tubular ends 9 Which are connected with the pistons l. A conduit I9 is connected to a supply of steam or other motive iiuid and enters the chest between the i0 pistons l so that the chamber between the pistons is always lled with steam. An opening II is formed in one side of the chest and a cover member I2 is fastened to said side of the chest and covers the opening and has a passage I3 l5 therein extending from the opening II into the space in the chest above the upper piston and said member is provided with a passage I4 which extends from the opening into the top part of the cylinder I and passages I5 in the member I2 and in the cylinder I connect the opening II With the lower part of the cylinder I. A passage I6 connects the opening II with the lower part of the chest below the lower piston l. A sliding valve Il has a recess part operating in the opening II for controlling those ends of the passages which open into the opening II and also for controlling the exhaust conduit I8. A stem I9 has an end passing through the tubular parts 9 of the yoke 8 and this stem carries the member 2t which extends into a notch in the valve Il, 5 a spring 2I being located in the notch for permitting yielding movement between the valve and the member 20. A spring 22 bears against one end of the member 20 which receives the stem i9 and said spring is adjustable by means of a 10 nut 23 carried by the yoke and bearing against the spring. This spring 22 frictionally connects the stem I9 and the member 2l) with the yoke so that these parts will be moved With the pistons l and said parts can be moved without movement l5 of the pistons. A rod 24 has its upper end threaded in the stem I9 as; shown in Figure 4 and this rod extends into the hollow part of the rod 3 and has a head 25 at its lower end. The rod 24 passes through a plate 26 attached to the 20 upper face of the piston 2 and a collar 2l is connected with the upper part of they rod 24 Within the cylinder I.

From the foregoing it will be seen that with the parts shown in Figure 1 steam is passed from 25 the chamber between the two pistons of the chestthrough the passage I4 into the upper end of the cylinder I and forces the piston 2 downwardly while the steam is exhausting from under the piston 2 through the passages I5 through the 30 recess of the valve I'I and out through the exhaust conduit I8. The chamber above the upper piston l of the chest is also connected to exhaust through the passage I3 and the chamber under the lower piston 'l is connected with the steam 35 supply through the passage I6. 'I'he passages I3 and I6 are so arranged that they will be uncovered on the respective strokes by valve Il, slightly before the passages I4 and I5 are uncovered. As the piston 2 moves downwardly the 40 plate 26 will strike the head 25 of the rod 24 and thus the rod will be moved downwardly, pulling the stem I9 with it which causes the valve Il to connect the passages I4 and I 6 with the exhaust I8 and connect the passages I3 and I5 with 45 the steam supply and thus the piston 2 will be moved upwardly as the steam is entering the lower part of the cylinder I While the upper part of the cylinder is connected with the exhaust. As soon as the Valve Il rides over the passages I4 50 and I6 the lower chamber of the chest is placed in communication with the exhaust so that pressure is removed from the bottom of the lower piston 'I and thus the two pistons can move downwardly without resistance and as the valve I1 55 and the rod I9 is moved downwardly before the pistons I move these pistons 'I are not resisted in the downward movement and the same action occurs when the parts are moving upwardly, the pistons 'I operating to finish the movement of the valve I'I after its initial movement by the rod 24 and the stem I9.

The pump cylinder is shown at 30 and the piston at 3 I, said piston being connected with the lower end of the rod 3 and the cylinder 30 is supported by the stand 32 and may be connected with the cylinder I by the brackets 33. A valve housing is shown at 34 and is in communication with the bottom of the cylinder 30 by a tubular connection 35 and a pipe line 36 connects the bottom of the housing with the top of the cylinder 30. An intake pipe 31 is connected to an intermediate part of the housing and in communication with an elongated port 38. The outlet pipe is shown at 39 and is in communication with a substantially semi-circular enlargement 40 at the side of the housing. A port 4I connects the upper part of the housing with the part 40 and a port 42 connects the lower part of the housing with the part 40. A sliding valve casing 43 is mounted in the intermediate part of the housing and controls the ports 4I and 42 and has a nipple 44 in its side thereof which is in communication with the port 38, the engagement of the projecting part of the nipple with the walls of the port 38 preventing turning movement of the casing 43. A spring pressed valve 45 controls a port 46 in the top of the casing and a spring-pressed valve 4'I controls a port 48 in the bottom of the casing. Thus on the downward stroke of the piston 3| the fluid in the cylinder 30 under the piston 3| will be forced through the tubular part 35 into the upper part of the housing 34 and the pressure thereof will close the valve 45 and force the casing 43 downwardly so that the port 42 will be closed when the port 4I opens and thus the uid can pass into the part 40 and escape through the discharge 39. The suction created by the downwardly moving piston 3l will cause a suction in the lower part of the housing by means of the pipe 36 so that the valve 41 will be moved to open position and the liquid flowing from the pipe 31 through the ports 38 and 44 into the valve casing 43 will be drawn from the bottom of the housing through the pipe 36 into the top of the cylinder 30. Then on upward stroke the liquid in the top of the cylinder 3U will be forced therefrom by the piston 3I through the pipe 36 into the lower part of the housing 34 and this liquid will raise the valve casing so as to close the port 4I and open the port 42 so that liquid can escape through the pipe 39 and the liquid flowing into the casing 43 will ow by the valve 45 through the coupling 35 into the lower part of the cylinder 30.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What is claimed is:-

A pump of the class described comprising a cylinder, a piston therein, means for reciprocating the piston, a valve housing having its upper end in communication with the bottom of the cylinder, a pipe connecting the lower end of the housing with the upper end of the cylinder, a slide valve casing in the housing, a supply pipe always in communication with the interior of the valve casing, upper and lower spring-pressed valves controlling upper and lower parts in the valve casing, an outlet member having upper and lower ports in communication with the housing, said ports being controlled by the sliding movement of the valve casing.

ELLIOT I. THORNTON. 

